
if (0) {
    puts 'failed full syntax negative'
} else {
    puts 'passed full syntax negative'
}

if (1) {
    puts 'passed full syntax positive'
} else {
    puts 'failed full syntax positive'
}

if (1) { puts 'passed if-only positive' }
if (0) { puts 'failed if-only negative' }
if (1) puts 'passed simple form positive'
if (0) puts 'failed simple form negative'